<template>
  <div>
    <!-- 面包屑导航区： -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意：只允许为第三季分类设置相关参数" type="warning" :closable="false" show-icon></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selected_keys"
            :options="catelist"
            :props="cascaderProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab区域 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态参数表格： -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  closable
                  v-for="(item,index) in scope.row.attr_vals"
                  :key="index"
                  @close="handleClose(index,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加的按钮: -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列： -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  closable
                  v-for="(item,index) in scope.row.attr_vals"
                  :key="index"
                  @close="handleClose(index,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加的按钮: -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列： -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 卡片视图区域 -->
    <!-- 添加（动态+动态）参数的对话框 -->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 商品分类列表:
      catelist: [],
      //指定级联选择器的配置对象
      cascaderProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      //   级联选择框双向绑定到的数组
      selected_keys: [],
      //   被激活页签的名字
      activeName: "many",
      //   动态参数数据
      manyTableData: [],
      //   静态属性的数据
      onlyTableData: [],
      //   控制对话框的显示和隐藏
      addDialogVisible: false,
      //   添加参数的表单数据对象：
      addForm: {
        attr_name: ""
      },
      //   添加表单的验证验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" }
        ]
      }
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //   获取所有商品分类
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      this.catelist = res.data;
    },
    handleChange() {
      if (!this.isBtnDisable) {
        this.getParamsData();
      } else {
        this.selected_keys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
    },
    handleClick() {
      //table页签的点击处理函数
      if (!this.isBtnDisable) {
        this.getParamsData();
      }
    },
    async getParamsData() {
      console.log(this.selected_keys);
      //发起数据请求
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      );
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        // 新增属性控制tag显示和隐藏：
        item.inputVisible = false;
        // tag标签输入的值
        item.inputValue = "";
      });

      console.log(res.data);

      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮添加参数：
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        );
        this.$message.success("添加参数成功!");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 编辑参数对话框：
    async showEditDialog(attr_id) {
      // 查询当前参数的信息：
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: {
            attr_sel: this.activeName
          }
        }
      );
      this.editForm = res.data;
      this.editDialogVisible = true;
    },

    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击按钮修改参数信息：
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        );
        this.$message.success("修改参数成功");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    // 根据id删除对应的参数项
    async removeParams(id) {
      this.$confirm("此操作将永久删除该属性, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      })
        .then(() => {
          this.$http
            .delete(`categories/${this.cateId}/attributes/${id}`)
            .then(res => {
              this.getParamsData();
              this.$message.success("删除参数成功");
            });
        })
        .catch(() => {
          this.$message({
            type: "info",
            message: "已取消删除"
          });
        });
    },
    // 文本框失去焦点或按下enter
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      // 如果没有return则说明输入了内容，需要发送请求
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      // 发起请求：
      this.$http
        .put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" ")
        })
        .then(res => {
          this.$message.success("新增参数成功");
        });
    },
    // 点击按钮展示tag输入框
    showInput(row) {
      row.inputVisible = true;
      // 让文本框自动获得焦点：
      // $nextTick方法的作用,就是当页面上的元素被重新渲染完毕后才会执行回调中的代码：
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除对应的参数可选项
    handleClose(index, row) {
      row.attr_vals.splice(index, 1);
      this.$nextTick(_ => {
        this.$http
          .put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(" ")
          })
          .then(res => {
            this.$message.success("删除参数成功");
          });
      });
    }
  },
  computed: {
    //   如果按钮需要被禁用则返回true,否则返回false
    isBtnDisable() {
      if (this.selected_keys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selected_keys.length === 3) {
        return this.selected_keys[2];
      }
      return null;
    },
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性 ";
    }
  }
};
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-cascader {
  margin-left: 10px;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 150px;
}
</style>